Kristin Cavallari has only been back on MTV for a few months, and she’s already pushed Audrina Patridge into crazytown by gallivanting around with not one, but two of Audrina’s exes. First, she set her sights on Justin-Bobby Brescia and now she’s dating Tal Cooperman, co-owner of DCMA Collective clothing. While her affair with Justin-Bobby was a storyline for the show, Kristin has been cozying up to Tal of her own accord. According to a source, “It’s brand new. They’re having a lot of fun enjoying getting to know each other better. It’s not for the show. They hit if off and have been hanging out off-camera.” Sorry, Audrina. Looks like another boy has gone to the dark side. [The Hollywood Gossip]

What’s up with starlets boyfriend shopping in other girls’ closets? Is it just that they have the same taste and run in the same circles—or do they do it on purpose? We’ve found a few other culprits who are guilty of stealing multiple ex-boyfriends from another woman.

What are you doing tonight at 10 pm? Oh, you’ll be here with me liveblogging the season premieres of MTV’s “The Hills” and “The City”? That sounds awesome. Click through to see the latest commentary on Kristin Cavallari‘s general meanness, Heidi and Spencer‘s general inanity, and Whitney Port‘s general blahness. And please, by all means, chime in!

Yesterday, after John Mayer headed to Twitter to shoot down rumors that he and Kristin Cavallari are dating, we shared with you one of the hilarious things he twoted about her. “My Milli has never slam danced with her Vanilli,” he said. But upon further exploration, we’ve noticed that is not the only amazing euphemism for sex that he wrote in this particular exchange. Here are some others:

• “I have never high fived Kristin Cavalari [sic] with my penis.”
• “We have never tasted the Skittles Rainbow together.”
• “I have never Bensoned her Hedges.”
• “Nor have I attempted to Bartle her James.” [Twitter]

That Mayer is all class. Care to pick a favorite sex descriptor?

This season of “The Hills” is gonna be different since Lauren Conrad left the show, opening up a spot for Kristin Cavallari, who was in the original “Laguna Beach” cast. Compared to Lauren’s demeanor, Kristin is a lot—how do we say this nicely—bitchier. While her personality can be a little caustic, Kristin and her loud mouth will make for some exciting TV. In the clip above, Kristin and a friend shop for a birthday present for Kristin’s ex, Brody Jenner. Watch a longer preview of the upcoming season at People.com.

We already knew “The Hills” was fake from that time Lauren Conrad told the ladies on “The View” that Spencer wasn’t on the other end of her apology phone call. Oh, and from that other time when L.C. wrote a book based on her experience on “The Hills,” and the characters weren’t sure if what they were going through was real or set up. But now, the show’s producers are totally slacking and not even trying to hide the fakery. Yesterday, a paparazzi photographer caught Kristin Cavallari flat-out reading through a “Hills” script with a producer before filming a clearly set-up romance between her and Justin Bobby. C’mon MTV, just so I don’t have to feel excessively guilty when I watch the next season, can’t you play pretend and at least attempt to cover up the phony reality? [NY Post]

Kristin Cavallari showed up to the Wizard of Oz Opening Night Gala at the Fashion Institute of Design & Merchandising in Los Angeles last night wearing the same dress Heather Graham wore to a premiere of “The Hangover.” Do we like it on either of them? Not so much.

Yes, but just for the cameras. The exes and new “Hills” castmates filmed a commercial for AT&T. [Beverly Hills, 5/28/09]

Kristin Cavallari is back! This morning, we learned that the “Laguna Beach” mean girl will be replacing Lauren Conrad as the star of “The Hills.” Dang, we knew her media disappearance over the past few years was too good to be true. The 22-year-old will show up on the May 31st season finale of “The Hills” where she’ll catch the bouquet at Heidi and Spencer’s wedding. Geez, I’d rather catch a live grenade.